Boab Metals (ASX:BML): Why This Silver Stock Is Down Despite High-Grade Sorby Hills Drill Results

Sonal Goyal

17 September 2026 03:33 AM AEST

Boab Metals (ASX:BML): Why This Silver Stock Is Down Despite High-Grade Sorby Hills Drill Results

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Highlights

Assay results confirm significant silver-lead mineralisation beyond current FEED Study pit designs at Sorby Hills, including 12.62m at 204g/t silver equivalent from Omega Central.
The Phase IX drilling program has been completed in full plus seven additional holes, taking the program approximately 15% beyond its original planned metreage.
Resource conversion drilling was completed across the B, Omega, Norton and Beta deposits, with 2,026 samples submitted for laboratory analysis.
Drilling is now underway at the Keep Zinc target, an early-stage exploration target 3.5km south of Central Omega.

Boab Metals Limited (ASX:BML) shares closed at $0.44 on 17 September 2026, down 3.33% or 1.5 cents on the day. The decline comes despite the company's announcement on 14 September 2026 reporting encouraging assay results from its 2026 Phase IX growth drilling program at the Sorby Hills Silver-Lead-Zinc Project in Western Australia's East Kimberley region.

The results confirmed mineralisation extensions beyond the boundaries of the project's current Front-End Engineering and Design (FEED) Study pit designs, across multiple deposits within the Sorby Hills tenement package.

Key Assay Results

Boab reported several standout intercepts from the drilling program, including 12.62 metres at 204g/t silver equivalent, 121g/t silver and 7.65% lead from hole SHSD_207 at Omega Central, and 3.26 metres at 186g/t silver equivalent, 50g/t silver and 12.66% lead from hole SHSD_201 at B Deposit. Further results included 3.00 metres at 152g/t silver equivalent from Omega S, 7.05 metres at 133g/t silver equivalent from Omega Central, and 8.65 metres at 72g/t silver equivalent from Omega S.

The company said these intercepts were located outside the areas covered by the current FEED Study pit designs, reinforcing what it described as the growth potential of the Sorby Hills deposit beyond its existing mine plan.

Phase IX Program Expansion

Boab confirmed it has completed the entire planned Phase IX drilling program, together with seven additional holes, taking the program approximately 15% beyond its original planned metreage. The company completed 47 sonic and diamond core holes for approximately 5,880 metres in total, including the seven additional holes covering approximately 930 metres.

Resource conversion drilling was completed across the B, Omega, Norton and Beta deposits, with 2,026 samples submitted for laboratory analysis. The program was designed to support near-term production ramp-up and longer-term value creation through resource-to-reserve conversion drilling, silver-focused resource expansion drilling, and exploration drilling across the broader Sorby Hills tenure.

Deposit-Level Drilling Detail

At B Deposit, eight holes were completed primarily along the eastern down-dip perimeter, with a follow-up hole confirming and extending mineralisation both up-dip and down-dip relative to the current pit shell. At Omega Deposit, 21 holes were completed, with wide and high-grade intercepts returned from several holes whose potential economic impact the company said will be assessed through a future Mineral Resource estimate and subsequent pit optimisation.

At Norton Deposit, three additional holes tested the interpreted continuity of high-grade silver-lead mineralisation below the Knox Formation, with assay results still pending at the time of the announcement. All nine planned holes at Beta Deposit have been completed, with core observations supporting the initial interpretation of stratabound mineralisation.

Keep Zinc Target and Manbarrum

Drilling is now underway at the Keep Zinc target, located 3.5 kilometres south of Central Omega, where three deep sonic and diamond holes totalling approximately 1,200 metres are planned. The company described Keep as an early-stage exploration target containing enriched zinc mineralisation with an approximate 1:1 lead-to-zinc ratio, with the discovery hole having returned 15.0 metres at 3.40% combined lead and zinc plus 12.5g/t silver from 242.55 metres.

Boab also intends to advance exploration at its 100%-owned Manbarrum Zinc-Silver-Lead Project, located 25 kilometres east of Sorby Hills, with drilling planned to test priority targets and assess the potential for new discoveries.

What to Watch Next

Further assay results remain pending and are expected to be received during the fourth quarter of 2026, including outstanding results from the Norton Deposit drilling. Progress on the Keep Zinc target drilling and any subsequent Mineral Resource re-estimation incorporating the Omega intercepts would represent the next meaningful updates for the project.

Given the company's description of Sorby Hills as fully funded and under construction, targeting first production in the second half of 2027, updates on construction progress alongside the exploration results will also be relevant to monitor.

Risks

While the reported intercepts extend mineralisation beyond the current FEED Study pit designs, the company notes that their potential economic impact will only be assessed through a future Mineral Resource estimate and subsequent pit optimisation, meaning the ultimate value of the extensions is not yet quantified. The Beta Deposit mineralisation is noted to be stratigraphically distinct from the main Norton, Omega and B Deposit mineralisation, and its geological interpretation remains preliminary.

As with any construction-stage Mining project, Sorby Hills remains subject to execution risk during the build phase, and the company's Mineral Resource estimate referenced in this release dates from December 2021, meaning the estimate has not yet been updated to reflect the current Phase IX drilling results.

Key Takeaways

Boab Metals' expanded Phase IX drilling program has delivered assay results that extend known mineralisation beyond the current FEED Study pit designs at several deposits within the Sorby Hills project, adding to the company's case for future Ore Reserve growth at what it describes as Australia's largest undeveloped, near-surface silver-lead deposit. With the project fully funded and under construction toward a targeted first production in the second half of 2027, the drilling results provide a data point for potential resource and reserve growth without yet altering the current mine plan. The share price decline on the day of the announcement suggests the market is treating the results as encouraging exploration data rather than an immediate re-rating catalyst, pending confirmation through a formal Mineral Resource update.

FAQs

Q: What were the key assay results from Boab Metals' Phase IX drilling?

A: Notable intercepts included 12.62m at 204g/t silver equivalent from Omega Central and 3.26m at 186g/t silver equivalent from B Deposit, both located beyond the current FEED Study pit designs.

Q: How much drilling was completed in the Phase IX program?

A: Boab completed 47 sonic and diamond core holes for approximately 5,880 metres, including seven additional holes for approximately 930 metres beyond the original planned scope.

Q: What is the Keep Zinc target?

A: Keep is an early-stage exploration target 3.5km south of Central Omega, containing enriched zinc mineralisation with an approximate 1:1 lead-to-zinc ratio, where drilling is now underway.

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